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Large magnetoresistance effects in Fe3O4.

X H Liu1, C F Chang, L H Tjeng

  • 1Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany. State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 6, 2019
PubMed
Summary
This summary is machine-generated.

Investigating magnetite (Fe3O4) revealed distinct magnetoresistance behaviors based on initial magnetic states. Zero-field cooling produced significant negative and positive magnetoresistance near the Verwey transition, unlike field-cooled samples.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Magnetite (Fe3O4) exhibits complex magnetic and electronic properties, including a Verwey transition.
  • Magnetoresistance (MR) in magnetic materials is sensitive to their magnetic structure and phase transitions.
  • Understanding the factors influencing MR in magnetite is crucial for potential applications.

Purpose of the Study:

  • To investigate the magnetoresistance (MR) of a single crystal of magnetite (Fe3O4).
  • To differentiate contributions to MR by preparing samples in distinct initial magnetic states (zero-field cooled vs. field cooled).
  • To elucidate the relationship between magnetic structure, Verwey transition, and observed magnetoresistance effects.

Main Methods:

  • Single crystal magnetite samples were prepared.
  • Samples were subjected to two distinct cooling procedures: zero-field cooling and field cooling from room temperature.
  • Magnetoresistance and magnetization measurements were performed as a function of temperature.

Main Results:

  • Zero-field-cooled magnetite showed a negative MR (~-20%) below the Verwey transition (~119 K), transitioning to a positive MR (~45% at 50 K).
  • This pronounced MR behavior was absent in field-cooled samples.
  • Magnetization measurements confirmed alignment of the easy magnetization direction in applied fields below the transition, correlating with MR changes.

Conclusions:

  • The initial magnetic state significantly influences the magnetoresistance of magnetite, particularly around the Verwey transition.
  • Observed MR effects are attributed to the interplay of structural changes and magnetocrystalline anisotropy.
  • Results highlight the importance of magnetic history in understanding the complex physical phenomena in Fe3O4.